Provider升级API
Model并新增类型的情况下，如果Consumer未同步升级，则Consumer侧每接收到response并反序列化的过程中都会尝试Load并不能识别的Class。并发较高的情况下，会出现线程长时间卡在类加载阶段而导致响应超时。
对应影响应能的代码在com.alibaba.com.caucho.hessian.io.SerializerFactory中，建议可对Hessian2SerializerFactory进行改造，重写public
Deserializer getDeserializer(String type)方法。
`try {
Class cl = Class.forName(type, false, _loader);
deserializer = getDeserializer(cl);
} catch (Exception e) {
log.warning("Hessian/Burlap: '" + type + "' is an unknown class in " +
_loader + ":\n" + e);
log.log(Level.FINER, e.toString(), e);
}`
异常日志如下:
`15-Jan-2019 18:40:02.393 WARNING [New I/O worker #1]
com.alibaba.com.caucho.hessian.io.SerializerFactory.getDeserializer
Hessian/Burlap: 'com.promotion.api.bean.model.ExtraServicePO' is an unknown
class in WebappClassLoader
context: ROOT
delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@119d7047
:
java.lang.ClassNotFoundException: com.promotion.api.bean.model.ExtraServicePO`
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/3305 ]
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